Surface characteristics of Y3Al5O12:Ce3+ phosphor with greatly enhanced photoluminescence after chemical defect-selective etching
来源期刊：JOURNAL OF RARE EARTHS2016年第10期
论文作者：孔荀 何志江 梁荣庆
文章页码：972 - 977
摘 要：The surface of a commercial Y3Al5O12:Ce3+ phosphor was modified by 99% NH4F+CH3COOH solution in a supersonic bath with water temperature of 80 oC for 4 h. The scanning electron microscopy（SEM） results showed that the edge angles were not as sharp as the unmodified particles and the flat surfaces turned rough with many micro-structures covered. Positron lifetime measurements quantitatively showed that surface defects were removed away by more than 50%. As a result, the photoluminescence determinations showed that the backscatter loss was reduced by 4.2% and the emission power was enhanced by 5.6% after the surface modification. The conversion efficiency was greatly improved from 47.3% to 51.1%, as presented by the fluorescence images. Therefore, it would be greatly helpful for the improvement of efficiency, transparency and stability of pc-LED. Moreover, this method was significantly suitable for mass production due to its easy operation and low cost.
孔荀，何志江，梁荣庆
Department of Light Sources and Illuminating Engineering, School of Information Science and Engineering, Fudan University
摘 要：The surface of a commercial Y3Al5O12:Ce3+ phosphor was modified by 99% NH4F+CH3COOH solution in a supersonic bath with water temperature of 80 oC for 4 h. The scanning electron microscopy（SEM） results showed that the edge angles were not as sharp as the unmodified particles and the flat surfaces turned rough with many micro-structures covered. Positron lifetime measurements quantitatively showed that surface defects were removed away by more than 50%. As a result, the photoluminescence determinations showed that the backscatter loss was reduced by 4.2% and the emission power was enhanced by 5.6% after the surface modification. The conversion efficiency was greatly improved from 47.3% to 51.1%, as presented by the fluorescence images. Therefore, it would be greatly helpful for the improvement of efficiency, transparency and stability of pc-LED. Moreover, this method was significantly suitable for mass production due to its easy operation and low cost.
关键词：
